Quick answers
- Does Hannah Grossman accept Medicare assignment?
- Yes. Medicare's clinician data says Hannah Grossman accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Hannah Grossman's NPI number?
- 1649321290. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Hannah Grossman is enrolled with Medicare (CMS data updated October 2, 2026).
- 558 N Ventu Park Rd, Suite AThousand Oaks, CA 91320 (805) 498‑0240
Group practices
Medicare enrollment lists Hannah Grossman as a member of this group (CMS data updated October 2, 2026).
- Grossman and Grossman M D S A Medical Corporation2 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Thousand Oaks
Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.
Other clinicians in Grossman and Grossman M D S A Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Medical school | University Of Southern California Keck School Of Medicine |
|---|---|
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649321290 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians